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Table 1 Participant characteristics by school and intervention

From: teen Mental Health First Aid: 12-month outcomes from a cluster crossover randomized controlled trial evaluation of a universal program to help adolescents better support peers with a mental health problem

  tMHFAa PFAb Combined
School 1 (ICSEA = 1031)
 Eligible at assignment 159 170 329
 Sample at baseline (n)c 116 115 231
 Sample at 1 year follow-up (n) 61 61 122
 Age (M, SD) 15.92, 0.52 16.03, 0.52 15.97, 0.52
 Gender (% female) 36.21 38.26 37.23
 English First Language (% yes) 74.14 74.78 74.46
School 2 (ICSEA = 1050)
 Eligible at assignment 230 230 460
 Sample at baseline (n) 200 209 409
 Sample at 1 year follow-up (n) 116 133 249
 Age (M, SD) 15.65, 0.39 16.06, 0.40 15.86, 0.45
 Gender (% female) 48.00 45.45 46.70
 English First Language (% yes) 84.5 87.08 85.82
School 3 (ICSEA 1091)
 Eligible at assignment 300 280 580
 Sample at baseline (n) 231 233 464
 Sample at 1 year follow-up (n) 101 114 215
 Age (M, SD) 15.84, 0.42 15.76, 0.44 15.80, 0.43
 Gender (% female) 38.53 45.92 42.24
 English First Language (% yes) 85.28 83.26 84.27
School 4 (ICSEA 1097)
 Eligible at assignment 300 273 573
 Sample at baseline (n) 261 240 501
 Sample at 1 year follow-up (n) 185 120 305
 Age (M, SD) 15.89, 0.62 15.90, 0.64 15.89, 0.63
 Gender (% female) 49.04 48.75 48.90
 English First Language (% yes) 52.11 47.08 49.7
Total Sample
 Eligible at assignment 989 953 1942
 Sample at baseline (n) 808 797 1605
 Sample at 1 year follow-up (n) 463 428 891d
 Age (M, SD) 15.82, 0.51 15.92, 0.52 15.87, 0.52**
 Gender (% female) 43.94% 45.55% 44.74%
 English First Language (% yes) 72.77% 72.15% 72.46%
  1. aAll students in Year 10 received teen Mental Health First Aid training (tMHFA)
  2. bAll students in Year 10 received Physical First Aid training (PFA)
  3. cAll students who completed student assent, age and gender, and at least one item on the John vignette were included in the analytic sample
  4. dAnalyses were conducted according to the intention to treat principle; all participants with missing data at follow-up were included in analyses (n = 1605) as well as an additional three students who gave data at follow-up only (n = 1608)
  5. **Significant group difference found at the p ≤ .001 level